Approach to a manufacture-oriented modeling of bent tubes depending on the curvature distribution during three-roll-push-bending

Groth, Sebastian; Engel, Bernd; Frohn, Peter

doi:10.1063/1.5034963

Cited by 9 publications

(5 citation statements)

References 6 publications

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“…Regarding the acquisition of the bending radius, Pan [10] developed a device featuring three inclinometers to measure the curvature ovaliation in cyclic bending. The acquisition and evaluation of a complete curvature profile is shown by Groth [11]. By including regularisation techniques the curvature of the whole bending line can be retrieved [12].…”

Section: State Of the Artmentioning

confidence: 99%

Inline Monitoring of the Geometry of Free-form Bent Components

Scandola,

Maier,

Meier

et al. 2024

IOP Conf. Ser.: Mater. Sci. Eng.

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The free-form bending process shows a high potential for the manufacturing of bent structural components. Especially in the automotive sector, the process can be employed for the production of arbitrary geometries evolving in the 3D-space, reducing tooling costs and production times. In addition, it is characterised by an outstanding flexibility, and allows the manufacturing of variants of a single component just with the adaption of the tool kinematics. Nevertheless, the reproducibility of the process is a challenging task, and a process monitoring approach is required. In this contribution, an inline-measurement strategy for evaluating the resulting geometry of free-form bent parts is developed. First, a review of the actual measurement system is given. Successively, the inline measurement of the bending radius using a laser displacement sensor, as well as of the bending angle by means of an IR-camera are presented. The obtained inline signals are then processed to retrieve the geometry of the obtained part, and the strategy is validated by comparison with the offline measurement results. The developed inline-system represents the first step towards the development and the monitoring of the free-form bending process.

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Section: State Of the Artmentioning

confidence: 99%

Inline Monitoring of the Geometry of Free-form Bent Components

Scandola,

Maier,

Meier

et al. 2024

IOP Conf. Ser.: Mater. Sci. Eng.

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show abstract

“…Engel et al [15] investigated the influence of mobile tool loci on forming curvatures distribution and designed a series of strategies for reducing the length of transition zones on bending lines. Based on the existing experimental datum, Groth et al [16] summarized the forming characters of curvature distribution along bending lines. When the bending process begins, the bending curvature would experience a viscous damping vibration before reaching constant.…”

Section: Introductionmentioning

confidence: 99%

Trajectory prediction of three-dimensional forming tube based on Kalman filter

Liang

Yang

2022

Int J Adv Manuf Technol

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This article focuses on the prediction of forming trajectory and process optimization during the forming process for the variable curvature tubes. Firstly, through cubic B-spline interpolation, the geometric characteristics of the axis of the target tube are obtained. The whole tube is “separated and then integrated,” and the relationship between geometric parameters and processing parameters is established to obtain the initial process parameters. Based on the extended Kalman filter (EKF) algorithm, the motion model and observation model of tube forming are presented section by section, and the relevant calculation and analysis are carried out. The forming trajectory has been predicted; moreover, the processing parameters are optimized during the processing process, in which the effectiveness of the processing optimum scheme is illustrated.

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“…The interpolation method was used to determine the radii distribution of spline contour and the desired bending contour could be obtained. Groth et al [20,21] analyzed the in uence of process parameters of three-roll-push-bending on the transition zone and found that there is a shape deviation between the CAD model and actual bent tube geometry due to the abrupt change in the curvature distribution. An algorithm was presented to determine the typical bending characteristics and describe the curvature distribution of transition zone.…”

Section: Introductionmentioning

confidence: 99%

Investigation on variation characteristics of bent tube axis and determination of bending die motion trajectory in free bending process

Cheng

et al. 2022

Int J Adv Manuf Technol

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In free bending process, the axis shape of bent tube is determined by the motion path of bending die. The bent tubes with different bending radii and bending directions can be integrally formed at one time by continuously adjusting the position and posture of die. To accurately form the pre-designed bent tube, the formation mechanism of bending arc of tube in free bending process was analyzed. The mathematical model between bending radius and de ection was established and the moving direction of bending die was also determined according to the plane space azimuth where the bending arc segment is located.The formation process of transition segments with variable curvature and variable bending direction is illustrated during the movement of bending die and the in uence law of transition segment on the axis shape was also explored. By comparing the axis deviation of experimental and simulate bent tubes, the length of transition segment and the moving path of bending die can be optimized. Finally, the applicability of free bending forming technology in forming bent tubes with different shape features was veri ed by conducting the free bending experiments on bent tubes with three typical shapes. Due to the high exibility of free bending forming technology, the work in this paper could promote the engineering application of this technology in the precise control of axis shape of bent tube.

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Approach to a manufacture-oriented modeling of bent tubes depending on the curvature distribution during three-roll-push-bending

Cited by 9 publications

References 6 publications

Inline Monitoring of the Geometry of Free-form Bent Components

Inline Monitoring of the Geometry of Free-form Bent Components

Trajectory prediction of three-dimensional forming tube based on Kalman filter

Investigation on variation characteristics of bent tube axis and determination of bending die motion trajectory in free bending process

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